Systems and methods for valley switching in a switching power converter

摘要

A controller may be configured to generate a control signal to activate and deactivate a switch of a switching power converter in order to control a switching period and a peak current of the switching power converter to maintain a regulated current of the switching power converter at a desired current level such that: if the switching period decreases below a minimum switching period, the controller increases the switching period by a ringing period of a voltage of the switch and increases the peak current to compensate for the increase of the switching period in order to maintain the regulated current, and if the peak current increases above a maximum peak current, the controller decreases the switching period by a ringing period of the voltage of the switch and decreases the peak current to compensate for the decrease of the switching period in order to maintain the regulated current.

主权项

1. An apparatus comprising:
a switching power converter configured to transfer energy from an input of the power converter to a load coupled to the power converter in conformity with a regulated current, the switching power converter comprising a switch and an energy storage device, wherein the regulated current is a function of a switching period of the switching power converter and a peak current of the energy storage device during the switching period; and a controller configured to generate a control signal to activate and deactivate the switch in order to control the switching period and the peak current to maintain the regulated current at a desired current level such that:
if the switching period decreases below a minimum switching period, the controller increases the switching period by a ringing period of a voltage of the switch and increases the peak current to compensate for the increase of the switching period in order to maintain the regulated current; andif the peak current increases above a maximum peak current, the controller decreases the switching period by a ringing period of the voltage of the switch and decreases the peak current to compensate for the decrease of the switching period in order to maintain the regulated current.